Zhang Heng invented an early device for detecting these; when one occurred a ball fell from a dragon's head into a frog's mouth
Since you have landed on this page then most probably you are looking for the Zhang Heng invented an early device for detecting these; when one occurred a ball fell from a dragon's head into a frog's mouth answer. This question was last seen on May 30 2023 Jeopardy TV Game Show.
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For more questions from this episode visit Jeopardy May 30 2023 Answers